Generic Image Library : any_image

00001 /*
00002     Copyright 2005-2007 Adobe Systems Incorporated
00003    
00004     Use, modification and distribution are subject to the Boost Software License,
00005     Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
00006     http://www.boost.org/LICENSE_1_0.txt).
00007 
00008     See http://opensource.adobe.com/gil for most recent version including documentation.
00009 */
00010 
00011 /*************************************************************************************************/
00012 
00013 #ifndef GIL_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP
00014 #define GIL_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP
00015 
00024 
00025 #include "variant.hpp"
00026 #include "../../image_view.hpp"
00027 #include "../../image.hpp"
00028 
00029 namespace boost { namespace gil {
00030 
00031 namespace detail {
00032     template <typename View> struct get_const_t { typedef typename View::const_t type; };
00033     template <typename Views> struct views_get_const_t : public mpl::transform<Views, get_const_t<mpl::_1> > {};
00034 }
00035 template <typename View> struct dynamic_xy_step_type;
00036 template <typename View> struct dynamic_xy_step_transposed_type;
00037 
00038 namespace detail {
00039     struct any_type_get_num_channels {   // works for both image_view and image
00040         typedef int result_type;
00041         template <typename T> result_type operator()(const T& v) const { return num_channels<T>::value; }
00042     };
00043     struct any_type_get_dimensions {    // works for both image_view and image
00044         typedef point2<std::ptrdiff_t> result_type;
00045         template <typename T> result_type operator()(const T& v) const { return v.dimensions(); }
00046     };
00047 }
00048 
00063 template <typename ImageViewTypes>
00064 class any_image_view : public variant<ImageViewTypes> {
00065     typedef variant<ImageViewTypes> parent_t;
00066 public:
00067     typedef any_image_view<typename detail::views_get_const_t<ImageViewTypes>::type> const_t;
00068     typedef std::ptrdiff_t x_coord_t;
00069     typedef std::ptrdiff_t y_coord_t;
00070     typedef point2<std::ptrdiff_t> point_t;
00071 
00072     any_image_view()                                                          : parent_t() {}
00073     template <typename T> explicit any_image_view(const T& obj)               : parent_t(obj) {}
00074     any_image_view(const any_image_view& v)                                   : parent_t((const parent_t&)v)    {}
00075 
00076     template <typename T> any_image_view& operator=(const T& obj)             { parent_t::operator=(obj); return *this; }
00077     any_image_view&                       operator=(const any_image_view& v)  { parent_t::operator=((const parent_t&)v); return *this;}
00078 
00079     std::size_t num_channels()  const { return apply_operation(*this, detail::any_type_get_num_channels()); }
00080     point_t     dimensions()    const { return apply_operation(*this, detail::any_type_get_dimensions()); }
00081     x_coord_t   width()         const { return dimensions().x; }
00082     y_coord_t   height()        const { return dimensions().y; }
00083 };
00084 
00086 //  HasDynamicXStepTypeConcept
00088 
00089 template <typename IVTypes>
00090 struct dynamic_x_step_type<any_image_view<IVTypes> > {
00091     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_x_step_type<mpl::_1> >::type> type;
00092 };
00093 
00095 //  HasDynamicYStepTypeConcept
00097 
00098 template <typename IVTypes>
00099 struct dynamic_y_step_type<any_image_view<IVTypes> > {
00100     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_y_step_type<mpl::_1> >::type> type;
00101 };
00102 
00103 template <typename IVTypes>
00104 struct dynamic_xy_step_type<any_image_view<IVTypes> > {
00105     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_type<mpl::_1> >::type> type;
00106 };
00107 
00108 template <typename IVTypes>
00109 struct dynamic_xy_step_transposed_type<any_image_view<IVTypes> > {
00110     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_transposed_type<mpl::_1> >::type> type;
00111 };
00112 
00113 } }  // namespace boost::gil
00114 
00115 #endif
any_image_view.hpp
